Sansui AU-7700

Discussion in 'Exclusively Sansui' started by sienahounds, Jul 10, 2018.

  1. sienahounds

    sienahounds New Member

    Messages:
    2
    I picked up a Sansui AU-7700 today. This is a one family system since 1975 when it was purchased new. Very nice cosmetic condition and clean on the outside. It sat idle for about 10 years in a closet. On first listen the left channel fades out a minute or two after the speaker relay kicks in, but it does sound nice. Reviews I’ve read are encouraging and suggest a voicing similar to tube amps.

    Would folks in the group please share your experiences repairing, refurbishing or upgrading this integrated amp. I plan to do a thorough cleaning and inspection to start with. I don’t like to start massive component replacements like caps without assessing current problems.

    Thanks in advance for sharing.
     

     

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  2. sregor

    sregor AK Subscriber Subscriber

    Messages:
    3,476
    Location:
    Mass
    Welcome to AK
    Channel fading out often is (but not always) relay contact problems. The quick test is to tap the relay when the channel is low - the channel will usually come back. Another symptom is that turning the volume up loud may kick the channel back in. Can also be dirty switches and controls - volume, balance and tape monitor circuits are the commonest culprits. A thorough cleaning should be done anyway. read the "Idiots guide to deoxit" thread in the general audio forum. Good luck with it
     
  3. sienahounds

    sienahounds New Member

    Messages:
    2
    Is the relay sealed or can it be disassembled for cleaning? Thanks
     
  4. sregor

    sregor AK Subscriber Subscriber

    Messages:
    3,476
    Location:
    Mass
    IIRC the relay cover can be taken off, but I haven't looked at one for a while (like 30 + years) so add a couple grains of salt.
     
  5. BilboBaggins

    BilboBaggins AK Subscriber Subscriber

    Messages:
    3,315
    Location:
    Ottawa, Canada
    Please note it is best to replace the relay once these problems start, and it seems to be the relay. Eliminate dirty controls first. The reason for replacing the relay is that it will require constant maintenance afterwards if all you do is clean it. Is it really worth it?
     
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